diff --git a/src/test/bench/shootout/ackermann.rs b/src/test/bench/shootout/ackermann.rs
index 27b4c3c05a7b..7eaf84ce2f11 100644
--- a/src/test/bench/shootout/ackermann.rs
+++ b/src/test/bench/shootout/ackermann.rs
@@ -13,13 +13,13 @@ fn ack(int m, int n) -> int {
 }
 
 fn main() {
-  check (ack(0,0) == 1);
-  check (ack(3,2) == 29);
-  check (ack(3,4) == 125);
+  assert (ack(0,0) == 1);
+  assert (ack(3,2) == 29);
+  assert (ack(3,4) == 125);
 
   // This takes a while; but a comparison may amuse: on win32 at least, the
   // posted C version of the 'benchmark' running ack(4,1) overruns its stack
   // segment and crashes. We just grow our stack (to 4mb) as we go.
 
-  // check (ack(4,1) == 65533);
+  // assert (ack(4,1) == 65533);
 }
\ No newline at end of file
diff --git a/src/test/bench/shootout/fibo.rs b/src/test/bench/shootout/fibo.rs
index 9045f3815b3f..8fc95f895c2b 100644
--- a/src/test/bench/shootout/fibo.rs
+++ b/src/test/bench/shootout/fibo.rs
@@ -15,8 +15,8 @@ fn fib(int n) -> int {
 }
 
 fn main() {
-  check (fib(8) == 21);
-  check (fib(15) == 610);
+  assert (fib(8) == 21);
+  assert (fib(15) == 610);
   log fib(8);
   log fib(15);
 }